[Pellet-users] Pattern data range restriction does not appear to work on xsd:string

[Evren Sirin]

On 3/25/08 7:10 PM, Arthur Peters wrote:
> I am playing with pattern restrictions and I found that they do not work on
> string property. When I ask the reasoner to do anything with such a
> restriction I get the following warning logged:
>
> WARN [main] (PelletVisitor.java:851) - Unrecognized base datatype string
>
> I have attached a small program that shows this behavior.
>
> A little investigation shows that in
> PelletVisitor.visit(OWLDataRangeRestriction
> node) nothing useful happens unless "baseDatatype instanceof XSDAtomicType"
> and the class that is used for strings (XSDString) does not implement that
> interface. This seems a bit odd to me.
>   

There is currently no support for pattern restrictions in Pellet neither 
for strings nor numeric types. Restrictions on some other facets 
(length, minLength, maxLength) are not supported either. So we mainly 
support restrictions on [min|max][Inclusive|Exclusive] facets for 
numeric and date/time types (plus enumeration of any datatype using 
owl:DataRange construct). (Un)supported features are not well-documented 
in the Pellet distribution but as part of OWL WG's datatype 
implementation report [1] we wrote down a detailed description of 
supported features in [2].
> Thanks for all of your work on pellet. It's a great library.
>   

Thanks,
Evren

[1] http://www.w3.org/2007/OWL/wiki/Unary_DT_Implementation
[2] http://spreadsheets.google.com/pub?key=pTmcCXR-dV6RpTEPxB0O-DQ
> -Arthur
>
>   
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